Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd748fdbbfcf98c…

MALICIOUS

PDF

28.2 KB Created: 2021-07-03 19:23:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a3534a33e752bee3fd01e7b31bdc1eca SHA-1: a8447fd948109916c832d94258aeaff026f8c71f SHA-256: 7bd748fdbbfcf98cd60dd65acac14c27b8580154c87ac3b22e449fac3f727fd1
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to a known malicious redirector infrastructure, specifically advertising a 'Coin Master Hack 2021'. The document body also contains a call-to-action phrase, reinforcing the lure. The embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0330

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/406889139/coin-master-hack-2021-android-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_001_off00001887.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1887 22848 bytes
SHA-256: 2a01892237211866ea4ba40674a32df3f8f8a31e1bb229c875e43166d61557a2
font_01_sfnt_off00004beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BEB 18580 bytes
SHA-256: f67f88b1ce6c5db430876b5da8c68a5518a964090ab37f1ab5b5be580e390e4d

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